Small Engines (Lawn Mowers, etc.): Age of mower, snapper mower, c model

Question
I have a snapper mower with the serial #16233731 and model # 21407T.  It
has a B&S 6HP diamond I/C Model#727802 Type2915-E1 Code97090958.
What year model is it?  

Answer
Hello Jim:

The Code number on the engine indicates the exact date it was manufactured. This system provides an easy way to determine the manufacture date of your engine.
The following is an example of interpreting date Code 97090958:

The first two digits (97) denote the year of manufacture. In this case it is 1997.
The next two digits (09) are the month of the year, which is January.
The following two digits (09) are the day of the month. In this case the 9th.
The final two digits designate the plant and assembly line.

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John

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John